CompanyLexer.java

package org.softlang.company.features.parser;

import static parseLib.acceptor.Acceptor.*;
import parseLib.acceptor.*;

/**
 * A combinator-based lexer for companies
 */
public class CompanyLexer {

    /**
     * Use common form of whitespace
     */
    private static final Acceptor WS = whitespace;

    /**
     * Macro for pre-composing token expressions with optional whitespace
     */
    private static Acceptor WS(Acceptor a) {
        return sequence(
                    optional(WS),
                    a
                );
    }

    /**
     * Double-quoted strings
     */
    public static final Acceptor STRING =
        WS(sequence(
                CHAR('"'),
                star(sequence(not(CHAR('"')),any)),
                CHAR('"')));

    /**
     * Floating point numbers
     */
    public static final Acceptor FLOAT =
        WS(sequence(
                plus(digit),
                optional(
                    sequence(
                        CHAR('.'),
                        star(digit)))));

    /**
     * Keywords and special symbols
     */
    public static final Acceptor SPECIAL(String s) {
        return WS(CHARS(s));
    }    

    /**
     * End of file
     */
    public static final Acceptor EOF =
        WS(eof());

}